Please bear with me on this one
If you put your finger on a key and hold it there the letter/number will repeat itself.aaaaaaaaa - I know you can slow down the rate of the repeat by using the Keyboard options in Control panel but is there anyway that this can be switched off completely - IE keys will only produce one letter/number when pressed and will not repeat until they are released and re-pressed.
The reason I ask is that on the Adult Education Course that I'm doing to teach basic IT skills there are handicapped people who don't have full control over their fingers - it's a supreme effort to find the key, even on a special large touch keyboard, and put their finger on it and double letters abound because they don't then take the hand away. (Oh, add to that one is Deaf and Dumb AS WELL so has to work with a one-to-one sign language specialist)
These people are highly intelligent, they are despite the handicaps way ahead of some of the physically able students but you can see the frustration building when they see the multiple letters appear on screen and then they have to laboriously back delete the excess letters.
I'll try any suggestions you can offer - please bear in mind the one student He's Deaf, Dumb, physically handicapped with a disease which means he has great difficulty controlling the muscles but if you have the patience he can type out some of the bluest jokes you have ever heard - but that's only when he's managed to enter his network password which can take 15 minutes (Cut out the double letters and we're on in 2 minutes and he'll be over the moon!).

There is more control on keyboard behavior if you have Accessibility Options installed (on the installation disk). I'm not sure if the repeat can be stopped altogether without installing and trying out the extra features though. This page has some information on the subject.

There is an option in Windows to help with this.

Choose 'Accessibility Options' from the Control Panel, tick the 'FilterKeys' option and go into the settings next to it. In here select the 'Ignore Repeated Keystrokes' box (Might be worded slightly different depending on which Windows version you're using) and it should stop the repeating problem (there should also be a text box for you to test it).

The 'StickyKeys' option might also be worth a look as well (it helps when you need to press SHIFT, CTRL or ALT with another key).

Thanks TW and DazzyD- I'll suggest the options to the Tutor (I'm only learning to teach!) but I'll also suggest it to the Co-ordinator for Inclusion Teaching (How's that for a PC Title!) - TW -Like it says in the text you proffered - you need to try each option with the individual to see which ones best - fortunately despite his many handicaps the student will try anything you tell/suggest to him and if it works he's over the moon, if it doesn't he shrugs his shoulders(laughs (about the only recognisable noise he can make! at himself!) and tries again!!.
Thanks again - if any of them work you'd need to be in the room to see the results (we'll be hanging on to the hardware!).

DazzyD - The sticky Key might be another godsend - the student can't find and hold down a key and then press another one (Underscore _ (shift + line next to 0) is part of the log in and he physically can't do it)
Dazzy_D - Some People think that football is a matter of life or death. I don't like that attitude. I can assure them it is much more serious than that" The great Bill Shankly 4th October 1981.